TY - JOUR
T1 - Correlations between age, kinematics, and chemistry as seen by the RAVE survey
AU - Wojno, Jennifer
AU - Kordopatis, Georges
AU - Steinmetz, Matthias
AU - McMillan, Paul
AU - Binney, James
AU - Famaey, Benoit
AU - Monari, Giacomo
AU - Minchev, Ivan
AU - Wyse, Rosemary F. G.
AU - Antoja, Teresa
AU - Siebert, Arnaud
AU - Carrillo, Ismael
AU - Bland-Hawthorn, Joss
AU - Grebel, Eva K.
AU - Zwitter, Tomaz
AU - Bienayme, Olivier
AU - Gibson, Brad
AU - Kunder, Andrea
AU - Munari, Ulisse
AU - Navarro, Julio
AU - Parker, Quentin
AU - Reid, Warren
AU - Seabroke, George
PY - 2018
Y1 - 2018
N2 - We explore the connections between stellar age, chemistry, and kinematics across a Galacto-centric distance of 7.5 < R(kpc) < 9.0, using a sample of similar to 12 000 intermediate-mass (FGK) turn-off stars observed with the RAdial Velocity Experiment (RAVE) survey. The kinematics of this sample are determined using radial velocity measurements from RAVE, and parallax and proper motion measurements from the Tycho-Gaia Astrometric Solution (TGAS). In addition, ages for RAVE stars are determined using a Bayesian method, taking TGAS parallaxes as a prior. We divide our sample into young (0 < tau < 3 Gyr) and old (8 < tau < 13 Gyr) populations, and then consider different metallicity bins for each of these age groups. We find significant differences in kinematic trends of young and old, metal-poor and metal-rich, stellar populations. In particular, we find a strong metallicity dependence in the mean Galactocentric radial velocity as a function of radius (partial derivative V-R/partial derivative R) for young stars, with metal-rich stars having a much steeper gradient than metal-poor stars. For partial derivative V-phi/partial derivative R, young, metal-rich stars significantly lag the LSR with a slightly positive gradient, while metal-poor stars show a negative gradient above the LSR. We interpret these findings as correlations between metallicity and the relative contributions of the non-axisymmetries in the Galactic gravitational potential (the spiral arms and the bar) to perturb stellar orbits.
AB - We explore the connections between stellar age, chemistry, and kinematics across a Galacto-centric distance of 7.5 < R(kpc) < 9.0, using a sample of similar to 12 000 intermediate-mass (FGK) turn-off stars observed with the RAdial Velocity Experiment (RAVE) survey. The kinematics of this sample are determined using radial velocity measurements from RAVE, and parallax and proper motion measurements from the Tycho-Gaia Astrometric Solution (TGAS). In addition, ages for RAVE stars are determined using a Bayesian method, taking TGAS parallaxes as a prior. We divide our sample into young (0 < tau < 3 Gyr) and old (8 < tau < 13 Gyr) populations, and then consider different metallicity bins for each of these age groups. We find significant differences in kinematic trends of young and old, metal-poor and metal-rich, stellar populations. In particular, we find a strong metallicity dependence in the mean Galactocentric radial velocity as a function of radius (partial derivative V-R/partial derivative R) for young stars, with metal-rich stars having a much steeper gradient than metal-poor stars. For partial derivative V-phi/partial derivative R, young, metal-rich stars significantly lag the LSR with a slightly positive gradient, while metal-poor stars show a negative gradient above the LSR. We interpret these findings as correlations between metallicity and the relative contributions of the non-axisymmetries in the Galactic gravitational potential (the spiral arms and the bar) to perturb stellar orbits.
KW - age
KW - chemistry
KW - correlations
KW - kinematics
KW - stars
UR - http://handle.westernsydney.edu.au:8081/1959.7/uws:48006
U2 - 10.1093/mnras/sty1016
DO - 10.1093/mnras/sty1016
M3 - Article
SN - 0035-8711
VL - 477
SP - 5612
EP - 5624
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 4
ER -